fix(share): 分享海报大数字压状态文案+删二维码与顶部品牌名

- 根因:状态文案 y=172(22px)、大数字基线 y=230(最大90px),多位数
  分钟数字顶部≈165 落入文案区(150~172),压住"完成"文案
- 重排垂直节奏:卡片放大,状态文案 y=184,大数字基线 y=286(上限84px,
  与文案下沿间距 34 安全),连续打卡 y=332
- 删顶部"平板的支撑"品牌名、删右下角二维码及"扫码一起打卡"引导
- 删除废弃资源 static/share-qr.jpg;导出改为绘制完直接导出无需等图

pages/timer/timer.js

@@ -1037,30 +1037,23 @@ Page({
         ctx.fillStyle = '#F7F8FA'
         ctx.fillRect(0, 0, W, H)
 
-        // --- top brand ---
-        ctx.fillStyle = '#888888'
-        ctx.font = 'normal 400 18px sans-serif'
-        ctx.textAlign = 'center'
-        ctx.textBaseline = 'alphabetic'
-        ctx.fillText('平板的支撑', W / 2, 36)
-
         // --- main card shadow ---
         ctx.save()
         ctx.fillStyle = 'rgba(0,0,0,0.06)'
-        roundRect(38, 54, 424, 250, 22)
+        roundRect(38, 44, 424, 320, 22)
         ctx.fill()
         ctx.restore()
 
         // --- main card ---
         ctx.save()
         ctx.fillStyle = '#FFFFFF'
-        roundRect(35, 52, 430, 246, 20)
+        roundRect(35, 42, 430, 316, 20)
         ctx.fill()
         ctx.restore()
 
         // --- gradient circle icon (same feel as completion-emoji-wrap) ---
         const circleX = W / 2
-        const circleY = 108
+        const circleY = 104
         const circleR = 40
         const grad = ctx.createLinearGradient(circleX - circleR, circleY - circleR, circleX + circleR, circleY + circleR)
         grad.addColorStop(0, '#4CAF50')
@@ -1075,23 +1068,24 @@ Page({
         drawStar(circleX, circleY, 20, 8, 5)
         ctx.fill()
 
-        // --- status text ---
+        // --- status text (kept well above the big number so a multi-digit
+        // minute count never overlaps it) ---
         ctx.fillStyle = '#333333'
-        ctx.font = 'normal 600 22px sans-serif'
+        ctx.font = 'normal 600 24px sans-serif'
         ctx.textAlign = 'center'
         ctx.textBaseline = 'alphabetic'
-        ctx.fillText(message, W / 2, 172)
+        ctx.fillText(message, W / 2, 184)
 
         // --- big number + unit ---
         const fmt = this._formatShareDuration(elapsed)
         const numLen = fmt.num.length
-        const numSize = numLen <= 2 ? 90 : numLen <= 3 ? 76 : numLen <= 4 ? 60 : 48
+        const numSize = numLen <= 2 ? 84 : numLen <= 3 ? 70 : numLen <= 4 ? 56 : 44
         ctx.font = `normal 800 ${numSize}px sans-serif`
         ctx.textAlign = 'right'
         ctx.textBaseline = 'alphabetic'
         ctx.fillStyle = primary
         const numX = W / 2 + 4
-        const numY = 230
+        const numY = 286
         ctx.fillText(fmt.num, numX, numY)
 
         ctx.fillStyle = '#666666'
@@ -1104,57 +1098,25 @@ Page({
           ctx.fillStyle = primary
           ctx.font = 'normal 500 18px sans-serif'
           ctx.textAlign = 'center'
-          ctx.fillText(`连续打卡 ${streak} 天`, W / 2, 272)
+          ctx.fillText(`连续打卡 ${streak} 天`, W / 2, 332)
         }
 
-        // --- bottom left: CTA text ---
-        ctx.textAlign = 'left'
-        ctx.textBaseline = 'alphabetic'
-        ctx.fillStyle = '#333333'
-        ctx.font = 'normal 700 22px sans-serif'
-        ctx.fillText('扫码一起打卡', 48, 338)
-
-        ctx.fillStyle = '#999999'
-        ctx.font = 'normal 400 15px sans-serif'
-        ctx.fillText('平板的支撑 · 每天进步一点点', 48, 366)
-
-        // --- bottom right: QR code ---
-        const qrSize = 88
-        const qrX = W - 48 - qrSize
-        const qrY = 308
-        const doExport = () => {
-          wx.canvasToTempFilePath({
-            canvas,
-            width: W,
-            height: H,
-            destWidth: W,
-            destHeight: H,
-            fileType: 'jpg',
-            quality: 0.9,
-            success: (r) => {
-              this._shareImageUrl = r.tempFilePath
-            },
-            fail: (err) => {
-              console.warn('[sharePoster] export failed', err)
-            }
-          })
-        }
-
-        const img = canvas.createImage()
-        img.src = '/static/share-qr.jpg'
-        img.onload = () => {
-          ctx.save()
-          ctx.fillStyle = '#FFFFFF'
-          roundRect(qrX - 6, qrY - 6, qrSize + 12, qrSize + 12, 8)
-          ctx.fill()
-          ctx.drawImage(img, qrX, qrY, qrSize, qrSize)
-          ctx.restore()
-          doExport()
-        }
-        img.onerror = () => {
-          // 二维码加载失败时仍导出一张无二维码的海报,避免分享按钮失效
-          doExport()
-        }
+        // --- export (no QR; draw immediately) ---
+        wx.canvasToTempFilePath({
+          canvas,
+          width: W,
+          height: H,
+          destWidth: W,
+          destHeight: H,
+          fileType: 'jpg',
+          quality: 0.9,
+          success: (r) => {
+            this._shareImageUrl = r.tempFilePath
+          },
+          fail: (err) => {
+            console.warn('[sharePoster] export failed', err)
+          }
+        })
       })
   },